Last night i suddenly couldn t move my thumb properly. When i try and straighten it out it won t, the middle joint is always a bit bent. Also, i can t move my thumb upwards. For example, when i have my palm faced down and i try and move my thumb towards the my face it will stop in line with my fingers. It also shakes when i do this. Around the base of my thumb there is a bump, almost looking like its dislocated. I have always been able to pop my thumbs and i sometimes do it accidentally when i m concentrating on something, it doesn t hurt, i just feel a little pop, and it goes back into its socket instantly. I don t know whether this is the problem, but i just thought i d throw that in there. i also spend alot of time on the computer, mainly games, and jumping requires me to press the space bar with my thumb, which i do quite alot. Again, i don t know if this is the cause of my thumb feeling restricted.